Question

おはぎ

③の訳し方がよく分かりません
試しに翻訳をしてみたのですが、onlyの使い方がしっくりこなく、Googleで検索をかけても翻訳とは違う訳し方をしてきます
訳し方と、できれば解説をお願いします

Is that the boy that [whom] you met at the bookstore?
2 Tell me about the book which [that] you like the best.
O The writer that [whom] I like is only eighteen years old.
When will the book which [that] I ordered arrive?
3

関係代名詞